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Eta Sculptoris

Location of η Sculptoris (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Sculptor
Right ascension	00 27 55.69820
Declination	−33° 00′ 25.7900″
Apparent magnitude (V)	4.8 - 4.9
Characteristics
Evolutionary stage	asymptotic giant branch
Spectral type	M4III
U−B color index	+1.81
B−V color index	+1.64
Variable type	SRS
Astrometry
Radial velocity (Rv)	+12.1±1.7 km/s
Proper motion (μ)	RA: −20.349 mas/yr Dec.: −49.911 mas/yr
Parallax (π)	7.0975 ± 0.2769 mas
Distance	460 ± 20 ly (141 ± 5 pc)
Absolute magnitude (MV)	−0.83
Details
Radius	79.96+3.70 −9.85 R☉
Luminosity	1,012.3±44.6 L☉
Temperature	3,641+247 −82 K
Other designations
η Scl, CD−33°152, FK5 2026, GC 544, HD 2429, HIP 2210, HR 105, SAO 192545, GSC 06994-01104
Database references
SIMBAD	data

Eta Sculptoris, Latinized from η Sculptoris, is a single, variable star in the central part of the southern constellation of Sculptor. It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude that fluctuates around 4.81. The star is located approximately 460 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s.

This object is an aging red giant star, currently on the asymptotic giant branch, with a stellar classification of M4III. With the supply of hydrogen at its core exhausted, the star has cooled and expanded. It now has 80 times the radius of the Sun. Eta Sculptoris is classified as a semiregular variable with a visual magnitude that fluctuates between +4.80 and +4.90, The pulsations have periods of 22.7, 23.5, 24.6, 47.3, 128.7 and 158.7 days. On average, this star is radiating over a thousand times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,641 K.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ Watson, Christopher (August 25, 2009). "Eta Sculptoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 20 July 2014.
3. ^ Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". Astronomical Journal. 104 (1): 275–313. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
4. ^ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050 (5th Revised ed.). Bibcode:1995yCat.5050....0H.
5. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
7. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
8. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
9. Streicher, Magda (December 2008). "The Sculptor's feast in art". Monthly Notes of the Astronomical Society of South Africa. 67 (11 and 12): 219–223. Bibcode:2008MNSSA..67..219S.
10. "MASCARA bright variable stars light curves". Centre de Données astronomiques de Strasbourg. University of Strabourg. Retrieved 1 December 2022.
11. Tabur, V.; Bedding, T. R. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. S2CID 15358380.

v t e Constellation of Sculptor
List of stars in Sculptor Sculptor in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ ι κ κ λ λ μ ξ π σ τ Variable R BW HD 4113 4208 (Cocibolca) 9578 Other Gliese 1 Gliese 42 HE 2359-2844 LTT 9779 TOI-178 WASP-8 WASP-45 WD 0137−349
Exoplanets HD 4113 b HD 4208 b TOI-178c WASP-8b
Star clusters Blanco 1 NGC 288
Galaxies	NGC 7 10 24 55 101 115 131 134 148 150 174 254 264 289 300 314 334 365 378 409 415 418 423 424 427 438 439 441 461 491 526 527 544 549 612 613 626 630 7793 7812 Other 2MASX J00482185−2507365 occulting pair A2744 YD4 Abell 2744 Y1 Cartwheel Galaxy Comet Galaxy ESO 540-030 H2356-309 Haro 11 IC 5332 Sculptor Galaxy Sculptor Dwarf Galaxy Sculptor Dwarf Irregular Galaxy UNCOVER-z12 UNCOVER-z13
Galaxy clusters Abell 2667 Abell 2744
Astronomical events SN 2009gj
Category

• M-type giants
• Asymptotic-giant-branch stars
• Semiregular variable stars
• Sculptor (constellation)
• Bayer objects
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects